Active Directory security groups can also be mail-enabled, this allows them to operate as both a security group and distribution list. This will result in a single list of members to be administered through Active Directory.
Please note, these instructions are for an existing security group.
To mail enable a security group-
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Start the Exchange Management Console.
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In the console tree, expand Recipient Configuration, and then click Distribution Group.
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In the action pane, click New Distribution Group. The New Distribution Group wizard appears.
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On the Introduction page, click Existing Group, and then click Browse.
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In Select Group dialog box, select the group that you want mail-enable, and then click OK.
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Click Next.
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On the Group Information page, complete the following fields:
- Display name By default, the display name is the same as the group name. You can modify the name in this field.
- Alias By default, the alias is the same as the group name. You can modify the name in this field.
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Click Next.
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On the New Distribution Group page, review the Configuration Summary. To make any configuration changes, click Back. To create the new distribution group, click New.
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On the Completion page, the Summary states whether the distribution group was successfully created. The summary also displays the Exchange Management Shell command that was used to create the distribution group.
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Click Finish.
Alternatively you can use the Exchange Management Shell-
Enable-DistributionGroup -Identity "Security Group Name"